s = input()
if s[0]=='R':
  if s[1]=='R':
    if s[2]=='R':
      print(3)
    else:
      print(2)
  else:
    print(1)
elif s[0]=='S':
  if s[1]=='R':
    if s[2]=='R':
      print(2)
    else:
      print(1)
  else:
    if s[2]=='R':
      print(1)
    else:
      print(0) s = input() s input() input if s[0]=='R':
  if s[1]=='R':
    if s[2]=='R':
      print(3)
    else:
      print(2)
  else:
    print(1)
elif s[0]=='S':
  if s[1]=='R':
    if s[2]=='R':
      print(2)
    else:
      print(1)
  else:
    if s[2]=='R':
      print(1)
    else:
      print(0) s[0]=='R' s[0] s 0 'R' if s[1]=='R':
    if s[2]=='R':
      print(3)
    else:
      print(2)
  else:
    print(1) s[1]=='R' s[1] s 1 'R' if s[2]=='R':
      print(3)
    else:
      print(2)
   s[2]=='R' s[2] s 2 'R' print(3) print 3 print(2) print 2 print(1) print 1 elif s[0]=='S':
  if s[1]=='R':
    if s[2]=='R':
      print(2)
    else:
      print(1)
  else:
    if s[2]=='R':
      print(1)
    else:
      print(0) s[0]=='S' s[0] s 0 'S' if s[1]=='R':
    if s[2]=='R':
      print(2)
    else:
      print(1)
  else:
    if s[2]=='R':
      print(1)
    else:
      print(0) s[1]=='R' s[1] s 1 'R' if s[2]=='R':
      print(2)
    else:
      print(1)
   s[2]=='R' s[2] s 2 'R' print(2) print 2 print(1) print 1 if s[2]=='R':
      print(1)
    else:
      print(0) s[2]=='R' s[2] s 2 'R' print(1) print 1 print(0) print 0 s = input() input() s
s = input()
if s[0]=='R':
  if s[1]=='R':
    if s[2]=='R':
      print(3)
    else:
      print(2)
  else:
    print(1)
elif s[0]=='S':
  if s[1]=='R':
    if s[2]=='R':
      print(2)
    else:
      print(1)
  else:
    if s[2]=='R':
      print(1)
    else:
      print(0)